Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4220926 | Noise detector employing plural delay circuits | — | 1980-09-02 |
| 4184687 | Electrical control system for the movement of the pickup arm of a disc-record player | John Pelham Wren | 1980-01-22 |